A.R.M.S.,Inc Ar-15/M16 Accessory Rails

The S.I.R. System Rail offers an additional location for the attachment of a variety of accessories to your firearm. It is an integrated rail for the S.I.R. system and one is provided with each, though it may also be purchased separately. It features a flathead screw insert and non-reflective black finish. Mfg: A.R.M.S.,Inc Specs: Weight 0.8 oz